Conflicts such as civil wars have manifold negative consequences on human development.In this survey article the existing literature is reviewed on the impact of conflict on educational attainment, health outcomes, inter-group trust and generalized social capital, as well as economic outcomes. It is stressed that four dimensions of adverse consequences from war exposure can give birth to four corresponding vicious cycles and war traps. Finally, a series of policies for peace are discussed, including policies that boost productivity and human capital accumulation, that foster inter-group trust and interaction, and that strengthen democratic institutions and governance. * Acknowledgements: Dominic Rohner gratefully acknowledges financial support from the ERC Starting Grant POLICIES FOR PEACE-677595.